Gatsby Jewellery Ltd has dated this piece to the 1930s.
But as lovely as the ring is, this is all about the diamond.

Accompanied by a GIA Natural Diamond Grading Report.
Cut:? Old European.
Colour:? D.
Clarity:? VS2.
Carat:? 1.03.
Circa:? 1930.
Size:? K (UK) or 5 1/8 (US). Free sizing available.
Measurements:? 6.76 x 6.78mm and sits 5mm from the finger.
Weight:? 2.79 grams.
Metal:? Platinum. Tested with a Niton DXL Precious Metal Analyzer.
Gatsby Jewellery Ltd has dated this piece to the 1930s.
Gatsby jewellery are a husband and wife team who have years of knowledge and experience in dealing in fine antique jewellery.
You can view the stock and full dealer information on the Gatsby Jewellery Ltd Profile Page